#define BLYNK_TEMPLATE_ID "TMPL3oAQi6AtY"
#define BLYNK_TEMPLATE_NAME "ULTRASONIC"
#define BLYNK_AUTH_TOKEN "TO76ujkrRc9CREskIE0mQkMvfmfOl1FT"

char auth[]=BLYNK_AUTH_TOKEN;
char ssid[]="Wokwi-GUEST";
char pass[]="";

#define BLYNK_PRINT Serial 
#include <WiFi.h>  
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

#define RLED 2
#define GLED 4
const int trigPin=16;
const int echoPin=17;

long duration;
int distance;

void setup()
{
  Serial.begin(9600);
  Blynk.begin(auth,ssid,pass);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(RLED, OUTPUT);
  pinMode(GLED, OUTPUT);

}

void loop()
{
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin,HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin,LOW);
  duration=pulseIn(echoPin,HIGH);
  distance=duration*0.034/2;
  Blynk.virtualWrite(V0,distance);
  Serial.print("distance:");
  Serial.print(distance);
  Serial.println(" cm");
  
  if(distance<100)

  {

    digitalWrite(RLED,HIGH);
    digitalWrite(GLED,LOW);
    Blynk.virtualWrite(V1,"Object Detected");
  }
  else
  {
    digitalWrite(GLED,HIGH);
    digitalWrite(RLED,LOW);
    Blynk.virtualWrite(V1,"No Object Detected");
  }
  }